Come to understand lies are awful (7)
I believe the answer is:
realise
'come to understand' is the definition.
(I've seen this before)
'lies are awful' is the wordplay.
'awful' is an anagram indicator.
'lies'+'are'='liesare'
'liesare' anagrammed gives 'REALISE'.
(Other definitions for realise that I've seen before include "Cotton on" , "Accept as fact or bring in as profit" , "get cash for property" , "net" , "Figure out" .)